---
title: "ZX81 User-Defined Graphics"
type: "article"
slug: "zx81-user-defined-graphics"
url: "http://localhost/article/zx81-user-defined-graphics/"
markdown_url: "http://localhost/article/zx81-user-defined-graphics.md"
published_at: "2020-10-27T17:17:57+00:00"
modified_at: "2024-06-23T07:50:26+00:00"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "Small circuit to allow internal RAM to be used for user-defined graphics when the computer has 16K RAM pack attached."
category:
  - name: "Electronics Today International"
    slug: "electronics-today-international"
    taxonomy: "category"
    url: "http://localhost/category/periodicals/electronics-today-international/"
post_tag:
  - name: "1983"
    slug: "year-1983"
    taxonomy: "post_tag"
    url: "http://localhost/tag/year-1983/"
  - name: "Hardware project"
    slug: "hardware-project"
    taxonomy: "post_tag"
    url: "http://localhost/tag/hardware-project/"
  - name: "ZX81"
    slug: "zx81"
    taxonomy: "post_tag"
    url: "http://localhost/tag/zx81/"
model:
  - name: "Sinclair ZX81"
    slug: "zx81"
    taxonomy: "model"
    url: "http://localhost/model/zx81/"
publication: "Electronics Today International"
publication_r:
  id: 10129
  title: "Electronics Today International"
  type: "periodical"
  url: "http://localhost/periodical/electronics-today-international/"
volume: "7"
issue: "11"
pages: "12-15"
pubdate: "November 1983"
archive_link: false
archiveurl: "https://www.americanradiohistory.com/Archive-Electronics-Today/Canada/80s/ETI-1983-11-Canada.pdf"
volumeissue: "v7n11"
---

Small circuit to allow internal RAM to be used for user-defined graphics when the computer has 16K RAM pack attached.